I think that with 2 "adequate" units it becomes a walk in the park, also a through shooter really helps clearing the messy enemy swarms pretty well.
I deploy Movie Tauburn and attacker Gundam F91, they can be both be gotten from the R+ shop so I think it's better than in the past...

CQ55 with that slow-downer shooter is super easy, I clear 1st time now, no more multiple attempts.

I can also clear CQ65 & 70 at the first attempt, getting that extra LB for Duo that's now lvl 75 made a decent difference.